That is a major problem imo with the system. the whole, "hey i don't make the laws", yea you don't make them and you don't know them either, you just think you know them and then you use your own (poor) judgement to arrest people. What we have then is police who think that arresting people is just there part and then if we disagree we can take it up in the courts.
If going to court was not extortion based and full of conflict of interests then maybe that would not be so bad.
So i think they should have to learn and understand the law, instead they are taught about terrorism and how everyone is a terrorist and they have militarised the police. I have seen the police training. I know that they don't learn the law... oh that is for lawyers, we just arrest people and then make them pay fines and use extortion to get money from them. Thinking they are the law. makes me sick.